Means for making windowed carton blanks coated on both sides



Feb. 11, 1941. J. L. EMERICK 2,231,574

MEANS FOR MAKING WINDOWED CARTONBLANKS COATED ON BOTH SIDES Filed Feb. 21, 1938 ZSheets-Sheet 1 Hi l Q 6M 7 IIYVENTOR. BY

ATTORNEY Feb. 11, 1941. J. L. EMERICK MEANS FOR MAKING WINDOWED CARTON BLANKS COATED ON BOTH SIDES Filed Feb. 21, 1938 25heets-Shee't 2 Q a R I VII/III):

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, INVENTOR.

ATTORNEY Patented Feb. 11, 1941 UNITED STATES PATENT OFFICE MEAN S FOR MAKING WINDOWED CARTON BLANKS COATED ON BOTH SIDES This invention relates to means to provide containers, particularly folding boxes made from boxboard which are interiorly, or interiorly and exteriorly moisture proofed or coated and pro- 5. videdwith transparent windows to enable the purchaser to see the content of the box but will not permit handling of the same.

Numerous'windowed cartons are now being used to show the content thereof, such cartons 410 are usually produced from treated board; mul-.

tiple ply paper board adhesively united, or the cartons are exteriorly coated with paraiiin or similar material to protect the content from outside atmospheric moisture or'to retain the atmospheric moisture within the carton, as may be required, containers for dry products such as cereals, crackers etc. would ordinarilybe aflected by the absorption of moisture, while bakers products having a high degree of moisture, such as cakes, doughnuts etc. must preserve the moisture to stay fresh and be salable. Uncoated cartons are oftenused, but in that case the goods are separately wrapped in waxed paper or other transparent material and then placed in the carton, which, of course considerably adds to the expense of thewrapper and extra labor.

These cartons have a transparent window of viscose or acetate, sold commercially under the trade names Cellophane, Sylphrap, andProtectoid or Kodapak respectively, adhesively attached to the interior of the carton.

One of the main reasons that cartons having windows are paraflined only on the putside instead on the inside is the fact that no adhesive will readily adhere to paramned surfaces and make a sealed joint between the board and the Cellophane. It is therefore the prime object of this invention to provide a windowed folding box which is parafiined on the inside, or inside and outside.

Another object of the invention is to produce .a folding carton having a transparent window by simple and effective means to provide an uncoated marginal area around the window opening of the carton, so that adhesive material may be readily applied thereto to effectively provide a seal between the Cellophane and the carton.

Still another object of the invention is to provide a folding paper carton that is paraflined on both sides of the stock to insure double moisture proofing and having a window of transparentan uncoated marginal area around the window opening when paraflining the folding paper carton, so that adhesive compound may be readily applied to effect a seal between the Cellophane and the card board.

It is also an object of the invention to produce a windowed folding paper carton, the inside of which being coated 0r impregnated with a proper substance to provide a moisture proof interior. thereby preventing damaging odors of the carton to effect the content of the container. I

' A further object of the invention is to provide a pair of rotatably supported cylindrical coating rollers, one of which being provided with a cutout portion for facilitating an uncoated area around the window opening of the carton and automatic synchronized means to restore, at predetermined intervals the periphery of the cutout portion of said roller to its normal cylindrical contour.

Another object of the invention is to produce a device for coating windowed cartons embodying a pair of opposed and rotatably supportedcylindrical coating rollers, one of which being adapted to completely coat the surface of the outside ofa carton blank and one adapted to produce an uncoated area around the window opening on the inside of the carton-blank.

Still another object of the invention is to provide a device of the character set forth which will at all times control the level of the coating material in the portion of the coating receptacle in which 'the coating delivery rolls are immersed.

With these and other objects in view, the invention consists of the construction and arrangement of parts hereinafter fully described, illustrated' in the accompanying drawings, and particularly pointed out in the claim hereto appended, it being understood that changes in the form, proportion and minor. details of construction within thescope of the claim may be made without departing from the spirit of sacrificing any of the advantages of the invention.

Like numerals of reference designate corresponding parts in all figures of the drawings.

In the drawings:

Figure 1 is a diagrammatic view of the device for applying coating material to both sides of a windowed folding papercarton blank built in accordance with this invention. I v

' Figure 2 is a sectional view along line 2 2 in Figure 3 of one of the coating material 615- pensers as used in the invention.

Figure 3 is a top view of the coating material dispenser shown in Figure 1.

7 I away, the top roller being of the mutilated cylindricaltype, shown in cross-section, and illustrating the mechanism within the roller which alternately moves the sector-plate in and :out of peripheral alignment, with the coating "roller in this illustration, the window opening of the carton blank being shown in central align- ;ment with the sector plate. ;Figure 6 is a view similar to Figure 5, showing the relative position of the window opening of the carton blank and the sector-plate of the .mutilated coating roller, the latter being advanced for a distance of ninety degrees and the sector-plate. and its associated members having assumed positions as shown. I

Figure -l is an elevational assembly view, part in section and part in outline, of the coating .roller which produces an uncoated area for applying adhesive material around the edge of the window opening of a carton blank to attach thereto a transparent sheet material. The sector plate beingeliminated, to disclose the ,-mechanism ,which reciprocatcs the same.

Referring to the drawings, the numeral l8 indicates a windowed carton blank of suitable material, fed through a pair of cylindrical'coating rollers H and 38 over belted endless conveyors l3 and I4.

Coating roller II is of the plain type and comprises a cylindrical hollow body l5 exteriorly covered with a layer of felted fibrous material l6. This body I5 is mounted in any' suitable manner on a shaft I! that is journaled in bearings I8 and l8'of a frame (not shown). This shaft may be continuous and extends horizontally through the coating roller, as shown in Figure 7.

Moisture proofing material, sucnas for instance molten paraflin, is applied to both sides of the carton blank III by means of the coating rollers II and 38 which receive the paraffin from the auxiliary rollers 22 and 23, the lowermost portions of which' extend into the tray-like forward and '24 (24) of a receptacle 25 (25) respectively containing the paraffin, as shown in Figure 1 of the drawings. These receptacles 25 (25) will be described later.

Referring now to Figures 5, 6 and 7 in which the preferred embodiment of a mutilated coating roller 38 is illustrated, the latter is shown in three sections, the end sections 38 and 48 and the mutilated middle section 4| and drawn together by suitable distance-rods. or bolts 42 and nuts 43.

, In-this case, the end sections 38 and 48 have endplates 44 and 45 respectively, each of which is provided with a hollow stub-shaft 48. 41. These stub-shafts consist of an .enlarged and externally threaded portion 48, adapted to be inserted through the central aperture 48 provided therefore in the end-plates 44 and 45 and securely held in position by nuts 58, as shown in Figure 7. The

outer end of said stub-shaft 48 is rotatably sup-- portedin a split bearing 5| of an upright bracket 52 of a bedplate (not shown). Similarly, the stub-shaft 41 is rotatably supported in a split bearing 54 of an upright bracket 55 of the bedsion 56 to which is keyed or otherwise secured a belt or chain wheel-51 by means of which the required motion is given to the coating roller 38.

Within the hollow stub-shafts 46 and 41 andextending through roller 38 is a centrally disposed stationary shaft 58, both ends of which being rigidly supported in suitable outboard extension brackets 59 and 88 and prevented from rotating by set-screws 6| or otherwise.

Before continuing further with the detailed description of the invention, the following should be noted:

As previously stated, the invention is principally concerned with moisture proofing (paraffin or other similar material) the interior, or interior and exterior surface of windowed folding cartons and providing an uncoated border around the edges of the window opening and thus make it possible to successfully apply a transparent cellulose tissue window made from viscose or acetate, such, as for instance'sold as Cellophane" to a moisture proofed surface. At present, no 'adhesive is known to make these tissues adhere to a paraiiin coated surface and this is one of the paramount reasons that windowed cartons are at present always only exteriorly paraffined, instead of where it should be; interiorly. This is especially true, for instance, in cake cartons, such as extensively used by bakers to hold cakes doughnuts, or other similar bakers products.

' Extensive tests have shown, that cartons interiorly naked or uncoated have a tendency to absorb the moisture from the packaged goods, thereby defeating one of the main objects of the carton that is, to retain the content moist and fresh for a considerable length of time.

If for economic reasons it is required to reduce the cost of the-carton and only one side of the carton is parafiin coated, the coating should be applied to the inner surface, although a parafin coat on both surfaces of the carton would provide a maximum of moisture proofness and at the plunger 82 comprises a substantially rectangu-.

lar sector-plate =63 having interiorly disposed bosses 84, each provided with an aperture 55 in which a guide rod 88 is slidingly inserted. These guide-rods 86 have a threaded end 61 which engages the threaded aperture 58 of suitable bosses 68 provided and arranged within the interior of roller 38, as shown (Figures 6 to 8). .A locknut l8 prevents the guide rods; from unscrewing.

The movement of the sector-like plunger 82 may be checked by collars H, each held in the desired position by a set-screw 12.

To normally retain said plunger 62 in a down position as shown in Figure 7, a pair of expansion coil-springs 13 are provided, one end of which being fixed to the underside of plunger 62 and the other end of which being secured to the inner wall of roller 38.

Extending inwardly of said sector-plunger 82 is an upwardly convex cam 14 supported on a block 15 to which the latter is bolted, or riveted, or, if desired the said sector-plate 83, cam I4 and block 15 may be cast integral, as shown.

Of course, the size and shape of said sector- 1 plate 83 and the peripheral opening I8 of coating roller 38 depends entirely on the size and shape of the window opening 88 of the carton.

The said peripheral opening 18 of coating roller 88, in which the edges ll of said sector-plate 83 flts, corresponds substantially to the window opening 38 of carton i8 including the width of the uncoated area around said window opening 88.

Sector-plunger 82, mounted within roller 38,

I receives its reciprocating movement by means of a cam-roller l8 rotatably supported in brackets 18 having a common integral hub 80 that is provided with a bore 8! adapted to be received by stationary shaft 88 and securely held there-' on by set-screws 82, or otherwise Figures and 6 illustrate'two positions of the I coating rollers II and 88 with respect to the window opening 38 of the carton blank III, whilethe circumference of the coating roller 38 corresponds to approximately the length, or if so'desired to the width of the carton blank l8; it may also be possible to increase proportionally the diameter of said roller to take care of two or more. blanks, or if found advantageous, two or more blanks may be fed side by side through the coat-.

ing rollers II and 88. Naturally, in either case, the windowopening 38 of carton blank l8 must register with the opening I8 of the coating roller 38 and the speed of the endless conveyor that feeds the carton blanks to the coating rollers must be adjusted in timed relation with the peripheral speed of the coating rollers II and 38.

Theplain coating roller ll may be of any desired diameter and movement of the same may be transmitted by a gear or chain connection in conjunction with the power operated mutilated coating roller 38, or otherwise.

In order to apply paraflin or a similar substance to both surfaces of a carton III, the parafiin is transferred from receptacles 2ii25 containing the molten parafiin by means of the auxiliary rollers 2-2-'23, the lowermostportions thereof extending into tray-like forward ends 24-24 of receptacles 25-25.

Referring now to Figures 1, 2 and 3, the said receptacles comprise a rectangular reservoir 83 having a front wall 84, side walls 85, 88 and a bottom 81, the latter of which being frontwardly extended to form a tray-like extension 88. Front wall 84 does not reach the bottom 81, but in-- plug 84. To keep the dirt out of the reservoir 83 I provide a cover 88.

To-use the above described receptacle 28-25,

' it is assumed that the reservoir 88 is filled with been gradually taken away by the auxiliary rollers 22-23, transferred to 'the coating rollers II and- 38 and then to the surfaces of the carton By this method, the liquid paraflin is constantly fed from the reservoir 83 to the tray-like extension 88, tlius establishing a predetermined permanent level of the molten solution which entirely eliminates adjustment of rollers 2223, 'to gradually lower the latter as the content of the receptacle is consumed, or to raise same when renewing or adding paraiiin.

Another important advantage of this means of dispensing molten parafiin is that only a small amount of the solution contactswith the auxiliary rollers-2223, thereby eliminating so-called scraping elements which usually wipe ofl the excessive paraflin.

The foregoing description includes the mechanism required to make certain provisions for applying cellulose (Cellophane) windows to a paraflin coated surface and, at the same time, it

' is to be understood that the herewith described invention is not concerned with the mechanism for applying a transparent window to a carton blank nor is it concerned how the carton blanks are fed to the coating rollers II and 38 in timed relati0n.

The operation of the preferred form of the invention is as follows: i

V Carton blanks iii are placed by suitable means on endless conveyor l3 which carries the same to and between the plain coating roller II and the mutilated coating roller 88, each of which receives the required amount of paraflin or simi-. lar material from an auxiliary roller 22 'and 23 respectively. Each of these rollers 22-2115 rotatably immersed into the tray-like extension 88 of receptacle 25 -25 which holds a certain quantity of hot molten paraffin at a uniform level at all times. frictional contact with said coating rollers surfaces of the carton blank.

As previously stated, it is one of. the main objects of'this invention to paraflin the interior,

or the interior and the exterior of a windowed folding carton. In the first case, only one of the paraflin receptacles would be required, that is for the mutilated coating roller 38, roller ll would, in that case merely serve as a squeezing roller.

As the carton-blanks pass between the coat-- ingrollers II and 38 it will be observed that the speed of the endless feeding 'conveyor i3 must be in synchronism with the peripheral speed of the coating roller 38 so that the opening 18 in roller 38 always registers with the window opening 38 of the carton blank l8.

Experiments have shown, that, when using a plain mutilated coating roller, in which the opening- 18 corresponds to the window opening 88 plus the uncoated border strip 31 of the carton blank, the 'parafiin coating on the exterior surface of the carton, especially around and opposite said uncoated strip of the interior surface will not be coated properly, due to the unsupported portion of the carton which constitutes the uncoated area to which the transparent window material (Cellophane) is adhesi'vely attached and thus be closed against the passage of air or moisture, while nevertheless, because of the These rollers 22-28 are in.

transparent character of the Cellophane it still permits visual observance of the product enclosed within the carton. i

. ure 6. In thatcondition, the outer surface pf sector-plate: 63 assumes'a position belowthe per -'Figures' 5 to?! show the interior mechanism of the mutilated coating roller 38, including the a I sector-plateflil'and cam ll; forming the plunger 1 62; which is mounted for intermittentv reciprocat- Ling motion. ,At every revolution of the mutilated coating roller 38 the cam roller 18 contacts and.

rolls alongcam 'll thereby raising and retaining the plunger 62 in a position in which the periphery of the sector-plate 63 conforms to the cylindrical exterior surface of roller 38, as shown in Figure 5 until the cam it again leaves cam-roller 18 which" in turn causes the spring-tensioned plunger 62 to assume a. position as shown in Figripheral surface of roller 3'8. J I

Obviously, in operation,- the'sector-plate. 53

'must be retained in a position as shown in Figf ure 5 until the window, opening 36 of "carton e describedniechanism, I Q

coated marginal borders around; the Y f'window; opening .of a windowed carton coated interiorly and exteriorly with paraflln or similar materlal, is

of great advantage for the reason that it not only provides an uncoated marginal border aroundthe to a device which places and cements thetransparent windows to the carton blankafter which the latter is transferred by suitable means to a place for storing: or packing.

* serving cakes, doughnuts 'or other bakers products considerably longer since the moisture of the productscannot be absorbed by the interiorlylO uncoated cartomas. .isfthe case at present.

- .avdevice for applying coating to a carton blank 'form edwith a window opening, a pair of rollers between which a carton blank is adapted topass one roller being. of the plain type,

a the other roller having a peripheral opening of larger dimensions than the window opening of the blank, an absorbent pad about the second blank .I 0 has passed 1 the line I of frictional contact of rollersf ii 'andlall and this is readily. ac-

complished by the circumferential length};

of the upwardly convened cam J4 in proportion through the'ipadded roller and about which the paddedlgrollerg'turns,aplunger in the padded rollerishiftableradially thereof into and out of anexte'nded position" to flll the registering openingsganddisposeits ;outer face flush with the had,]*jr0 ds;mounted{in said padded roller and engas'ed'in sockets formed in said plunger to slidably; mount the plunger, springs mounted in the roller and connected with the plunger for exerting inward pull and. shifting the plunger inwar ly, collars upon said rods shiftable longi tudinally thereon to adjusted positions for limiting inward movement of the plunger, and an arm fixed upon said shaft and projecting radially therefrom for engaging the plunger and temporarily shifting the plunger outwardly to its extended position during rotation of the roller about the shaft.

JOHN L. EMERICK. 

